Q. No.Photoreceptors rods or cones are unique as they are activated by:
1. depolarization
2. hyperpolarization
3. repolarization
4. decomposition
1. depolarization
2. hyperpolarization
3. repolarization
4. decomposition
The extraocular muscles are innervated by all the following cranial nerves except:
1. oculomotor
2. trochlear
3. abducens
4. optic
The outermost meninx that provides a thicker and protective layer is the:
1. dura mater
2. arachnoid mater
3. pia mater
4. gray mater
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The part of the brain that controls important cognitive skills in humans, such as emotional expression, problem solving, memory, language, judgment, and sexual behaviors is the:
| 1. | frontal lobe | 2. | parietal lobe |
| 3. | occipital lobe | 4. | temporal lobe |
The part of the brain that has the most effect on maintenance of homeostasis is:
| 1. | thalamus | 2. | hypothalamus |
| 3. | infundibulum | 4. | mammillary body |
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Which is the smallest cranial nerve that innervates the superior oblique muscles of the eye?
1. trochlear
2. abducens
3. oculomotor
4. optic
Which of the following is not true regarding parasympathetic system?
1. Preganglionic fibers arise from the thoracic and lumbar regions of the spinal cord.
2. Terminal ganglia are located close to effector organs.
3. Preganglionic fibers are myelinated; postganglionic fibers are not.
4. Parasympathetic postganglionic fibers secrete acetylcholine.
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A duct within the mesencephalon, contains cerebrospinal fluid (CSF), and connects the third ventricle to the fourth ventricle is called:
| 1. | interventricular foramen | 2. | cerebral aqueduct |
| 3. | foramen of Monro | 4. | foramen of Magendie |
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A catecholamine is released as a neurotransmitter by:
1. preganglionic sympathetic fibers
2. postganglionic sympathetic fibers
3. preganglionic parasympathetic fibers
4. postganglionic parasympathetic fibers
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